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 Bill Gates this year focused in his annual letter, which launched Monday night, he tackles just one subject: clean, accessible energy.  It was a curious decision for the famously intellectually-expansive Gates. Focusing on energy makes all of his other life-improving efforts easier to enact. Get the more than 1 billion people who live without energy hooked to the grid and suddenly, “you can run hospitals, light up schools and use tractors to grow more food.”